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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Accumulated Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2018 $ 409,762 $ 205 $ 211,431 $ (22,370) $ 221,328 $ (832)
Beginning Balance, Shares at Dec. 31, 2018   20,528,230   (1,258,250)    
Impact of adoption of ASU | ASU 2016-02 [Member] (1)       (1)  
Comprehensive income:            
Net income 37,290       37,290  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax 10,972         10,972
Comprehensive income 48,262          
Common stock issued upon exercise of options $ 20   20      
Common stock issued upon exercise of options, Shares 5,000 5,000        
Common stock issued $ 560   560      
Common stock issued, Shares   23,281        
Share-based compensation 482   482      
Dividends to shareholders (9,642)       (9,642)  
Ending Balance at Jun. 30, 2019 449,443 $ 205 212,493 $ (22,370) 248,975 10,140
Ending Balance, Shares at Jun. 30, 2019   20,556,511   (1,258,250)    
Beginning Balance at Mar. 31, 2019 430,405 $ 205 211,700 $ (22,370) 235,908 4,962
Beginning Balance, Shares at Mar. 31, 2019   20,533,230   (1,258,250)    
Comprehensive income:            
Net income 17,890       17,890  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax 4,980         4,980
Change in deferred tax valuation allowance 198         198
Comprehensive income 23,068          
Common stock issued 560   560      
Common stock issued, Shares   23,281        
Share-based compensation 233   233      
Dividends to shareholders (4,823)       (4,823)  
Ending Balance at Jun. 30, 2019 449,443 $ 205 212,493 $ (22,370) 248,975 10,140
Ending Balance, Shares at Jun. 30, 2019   20,556,511   (1,258,250)    
Beginning Balance at Dec. 31, 2019 $ 430,215 $ 205 213,004 $ (22,370) 227,165 12,211
Beginning Balance, Shares at Dec. 31, 2019 19,302,583 20,560,833   (1,258,250)    
Impact of adoption of ASU | ASU 2016-13 [Member] $ (594)       (594)  
Comprehensive income:            
Net income 34,748       34,748  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax 6,967         6,967
Comprehensive income $ 41,715          
Common stock issued upon exercise of options, Shares 0          
Common stock issued $ 1,360 $ 1 1,359      
Common stock issued, Shares   28,476        
Share-based compensation 531   531      
Dividends to shareholders (10,431)       (10,431)  
Ending Balance at Jun. 30, 2020 $ 462,796 $ 206 214,894 $ (22,370) 250,888 19,178
Ending Balance, Shares at Jun. 30, 2020 19,331,059 20,589,309   (1,258,250)    
Beginning Balance at Mar. 31, 2020 $ 436,956 $ 205 213,267 $ (22,370) 232,159 13,695
Beginning Balance, Shares at Mar. 31, 2020   20,561,034   (1,258,250)    
Comprehensive income:            
Net income 23,948       23,948  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax 5,483         5,483
Comprehensive income 29,431          
Common stock issued 1,360 $ 1 1,359      
Common stock issued, Shares   28,275        
Share-based compensation 268   268      
Dividends to shareholders (5,219)       (5,219)  
Ending Balance at Jun. 30, 2020 $ 462,796 $ 206 $ 214,894 $ (22,370) $ 250,888 $ 19,178
Ending Balance, Shares at Jun. 30, 2020 19,331,059 20,589,309   (1,258,250)